JPH07272682A - Discharge lamp and illumination device - Google Patents

Abstract

PURPOSE:To prevent external leads from contacting each other and also an exhaust pipe provided in a stem tube from breaking by furnishing an elastic holder with an exhaust pipe accommodating hole and a pair of lead accommodating holes, and positioning the exhaust pipe and the external leads in the respective holes. CONSTITUTION:A stem 3 at each end of a bulb 1 forms a sealing part 2. An elastic holder 8 made of a heat-resistant material is resiliently inserted in a stem tube 3c ranging from the crush seal part 3a of the stem 3 to its flare part 3b. The holder 8 is provided in the center with an exhaust pipe accommodating hole 83, through which an exhaust pipe 31 of the stem 3 is inserted, and also with a pair of load accommodating holes 85 on the outside of the hole 83 for admitting insertion of a pair of external leads 5c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp mounted on a reading device or a backlight device used for OA equipment such as a fax machine, an electronic copying machine, a personal computer and a word processor, and a display device such as a television, or a lighting device. The present invention relates to a discharge lamp used in, and a lighting device such as the above-mentioned display device or lighting fixture equipped with these lamps.

[0002]

2. Description of the Related Art Fluorescent lamps are known as discharge lamps having excellent luminous efficiency and long life in place of incandescent lamps. This fluorescent lamp is equipped with an electrode (hot cathode) consisting of a filament coil in which a tungsten wire is wound in a double or triple layer on both ends of a glass bulb whose inner surface is coated with a phosphor film. Is filled with an inert gas such as argon gas and an appropriate amount of mercury for facilitating discharge.

When a current is applied to the above electrode (hot cathode) to preheat the filament coil, thermoelectrons are emitted from the filament coil into the bulb, and the thermoelectrons are attracted to the high voltage of the opposite electrode and move. A discharge starts between the electrodes. Electrons that move due to this discharge collide with mercury atoms in the bulb and emit ultraviolet rays, which excites the phosphor coated on the inner surface of the bulb and emits visible light outside the bulb. This luminescence can be obtained in various luminescent colors such as white, daylight color, blue, and pink depending on the type of phosphor.

In recent years, this fluorescent lamp has been used not only for lighting to be attached to lighting equipment, but also as a light source for reading or exposure of a fax machine or an electronic copying machine, an OA for a personal computer, a word processor, etc.
It is widely used as a light source for backlights of display devices such as devices and televisions.

[0005] Then, for example, with the progress of high-brightness colorization and miniaturization of personal computers and televisions,
Similarly, fluorescent lamps used in backlight devices are required to have a smaller diameter, smaller size, lower power consumption, high brightness, high color rendering properties, and long life, compared with fluorescent lamps for general lighting. ing. In particular, since these devices are for consumer use, the lamps are not replaced in principle, and a life of 10,000 hours or more is required.

Therefore, the compact fluorescent lamp for the backlight device is designed optimally from the viewpoint of life as well as current and voltage, the kind of rare gas to be encapsulated and the amount of mercury, so as to be compatible with low power consumption. There is.

As a means for downsizing a straight tube type fluorescent lamp, there is a type in which a base is not attached to the tube end. By not using the base, the total length of the lamp can be shortened not only by the base portion but also by the socket for mounting the base. On the contrary, if the lamp length is the same as the conventional one, the effective light emission length can be increased, and the efficiency of the lamp can be increased.

Therefore, recently, when a plurality of, for example, 2 to 6 fluorescent lamps having hot-cathode type electrodes are mounted in parallel for a large backlight, the lamps are not provided with a base at their ends. In addition, a wire harness system is often used in which a power supply line is directly connected to an external lead wire derived from each lamp, and a plurality of these power supply lines are aligned and connected to a terminal piece in order.

However, when a large number of lamps are mounted, when the power supply line directly connected to the external lead wire is routed inside the OA equipment or the like, the convergence of the power supply lines becomes complicated. Also, the power supply line must be housed in a narrow space around the equipment,
At this time, undesired tensile stress is applied to the external lead wires, sometimes the external lead wires are caught in the exhaust pipe, and the exhaust pipe may be broken and the lamp may leak when it is forcibly removed. The tip portion at the tip of the exhaust pipe protruding from the opening of the stem tube is likely to come into contact with another object, and the tip portion may be chipped to cause a leak. In addition, there is a problem in that external lead wires that are not insulated from each other in the stem tube come into contact with each other to cause a short circuit and the lamp becomes defective.

[0010]

Therefore, in order to solve such a problem, it is known to fill the stem tube with a silicone resin adhesive or the like to prevent the external lead wires from contacting each other. . However, even if a silicone resin adhesive is injected into a tube with a small inner diameter,
The adhesive did not reach the root of the exhaust pipe because it had viscosity and the gas in the tube was difficult to escape, and could only be filled near the opening of the stem tube. Also,
There is nothing that can be done if it takes time to inject this silicone resin adhesive etc., but it takes a lot of time and productivity is not good, and the adhesive pulls the thread and injects the dirt in the work place is extremely time-consuming and troublesome to maintain. Was required. In addition, while the silicone resin adhesive or the like is filled in the vicinity of the opening of the stem tube as described above, it has an effect of preventing contact between the external lead wires, but the exhaust pipe of the exhaust pipe is pulled when the external lead wires are pulled. When the stress was applied to the vicinity of the root part, the exhaust pipe could be broken. Also, due to the tip-off work, the tip portion of the exhaust pipe protruding from the opening of the stem tube is not covered with an adhesive, and if something touches this tip portion, the tip portion There was a case where it leaked due to chipping.

The present invention has been made in view of the above problems,
An object of the present invention is to provide a discharge lamp and a lighting device equipped with this lamp, which do not cause mutual contact between external lead wires or breakage of an exhaust pipe in a wire harness system in which a power supply line is directly connected to an external lead wire.

[0012]

DISCLOSURE OF THE INVENTION The discharge lamp of the present invention comprises:
A straight tube-shaped glass bulb, flare stems sealed at both ends of the bulb, and a hot cathode connected to at least two lead wires provided in the flare stem; enclosed in the glass bulb A discharge sustaining medium,
An elastic holder is provided, which is elastically inserted into the stem tube and has an accommodating portion for inserting the plurality of lead wires with insulating partition walls interposed therebetween.

A straight tubular glass bulb, flare stems respectively sealed at both ends of the bulb, an exhaust pipe provided in the flare stem, and a hot cathode connected to at least two lead wires, An elastic holder provided with a discharge sustaining medium sealed in the glass bulb, and an accommodating portion that is elastically inserted into the stem tube and that inserts the exhaust pipe and the plurality of lead wires through insulating partition walls. It is characterized by having and.

The elastic holder is characterized in that a locking portion for supporting the lamp is formed at the base end portion.

The lead wire accommodating portion of the elastic holder is a through hole or a notch.

Further, the illumination device of the present invention is characterized in that the above-mentioned discharge lamp is mounted on a fixture or a lamp.

[0017]

In the stem tube, since the housing for guiding the individual external lead wires and the exhaust pipe is formed, the external lead wires do not contact each other or the exhaust pipe.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 is a partially cutaway perspective view showing a state in which a plurality of discharge lamps used in a backlight device and the like are arranged, FIG. 2 is an enlarged front sectional view of an end portion including a stem portion of the fluorescent lamp of FIG. 1, and FIG. FIG. 3 is a perspective view of an elastic holder mounted in the stem tube in FIG. 2.

This discharge lamp is, for example, a straight tube type fluorescent lamp L, which has an outer diameter of about 8 mm and an inner diameter of about 6.
mm, tubular glass bulb 1 made of soda lime glass with a total length of about 300 mm 1
A stem 3 having a flared portion 3b is sealed at the end.

The inner wall surface of the valve 1 is, for example, blue.
A three-wavelength type phosphor film 4 in which phosphors having a light emitting region in green and red are mixed is formed, and mercury and a rare gas such as argon (Ar) or neon (Ne) as a discharge sustaining medium are formed inside the bulb 1. It is enclosed alone or in a mixture.

Further, the stem 3 sealed at both ends of the bulb 1 (both ends are the same, so description will be made with reference to one) will be described with reference to lead glass as shown in an enlarged view in FIGS. Alternatively, a pair of lead wires 5 and 5 and the exhaust pipe 31 are crushed and sealed at one end side with soda lime glass, and a flare portion 3b formed at the other end side is sealed with the opening portion of the glass bulb 1. Then, the sealing portion 2 is formed.

The above-mentioned lead wire 5 is a heat-sealing wire 5a made of dumet wire or the like, and a filament coil connected to one end of the sealing wire 5a and having a tungsten wire wound in a double or triple manner inside the bulb 1. It is composed of an internal lead wire 5b connecting the cathode 6 and an external lead wire 5c connected to the other end of the sealing wire 5a and connected to a power supply wire 7 outside the valve 1. The portion of the sealing wire 5a made of a Dumet wire having a coefficient of thermal expansion matched with that of the glass of the stem 3 is hermetically sealed in the crushing sealing portion 3a of the stem 3.

In addition, from the crushing sealing portion 3a to the flare portion 3
A substantially cylindrical elastic holder 8 formed of a heat-resistant member such as silicon rubber is elastically inserted and mounted in the stem tube 3c up to b. The elastic holder 8 has a main body portion 8a whose outer diameter is substantially the same as the inner diameter of the stem tube 3c, and an exhaust pipe insertion hole 83 (as shown in FIG. 3) in which the exhaust pipe 31 of the stem 3 is loosely inserted in the central portion. However, a pair of lead wire insertion holes 85, 85 for passing the external lead wires 5c, 5c are formed outside the exhaust pipe insertion hole 83. In addition, 8b is a chamfered part having an inclined surface. Further, 7a indicates an insulating coating provided around the power supply line 7.

In the manufacture of the above fluorescent lamp L, the flare portion 3b of the stem 3 having the heat electrodes 6 at both ends of the glass bulb 1 having the phosphor film 4 formed on the inner surface is sealed. Then, after exhausting the inside of the valve 1 through the exhaust pipe 31 to fill the inert gas and mercury, the exhaust pipe 31 is chipped off to obtain a wire valve.

Next, the pair of lead wire insertion holes 85, 85 of the elastic holder 8 and the exhaust pipe insertion hole 83 are aligned with the distal end portions of the external lead wires 5c, 5c and the exhaust pipe 31, respectively, and the distal end surface of the elastic holder 8 is fitted. The elastic holder 8 is mounted in the stem tube 3c by pushing the insertion portion 8a into the stem tube 3c from the opened flare portion 3b and inserting it. The external lead wires 5c, 5c and the exhaust pipe 31 are located in the lead wire insertion holes 85, 85 and the exhaust pipe insertion hole 83.

After that, the power supply line 7 is connected to the tip portions of the external lead wires 5c and 5c, and the exposed conductor portion in the vicinity of this connection portion is covered with the insulating coating 7a, whereby the lamp L is completed.

As shown in FIG. 1, the lamp L is composed of a plurality of lamps L to Ln, and is used by mounting it on a backlight device (not shown). At this time, the power supply lines 7, 7, ... Derived from each of the lamps L to Ln are laid out for wiring in the apparatus, and even if stress is applied to the lead wire 5 portion, the exhaust pipe 31 and other lead wires 5 are connected. It is possible to provide a wire harness system that does not get entangled and does not cause any problems.

The fluorescent lamps L to Ln having such a structure are
When connected to a predetermined high-frequency lighting circuit and energized, a discharge occurs between the electrodes 6 and 6 made of hot cathodes, and the electrons moving in the bulb 1 collide with mercury atoms to emit ultraviolet rays, and this ultraviolet rays emits this ultraviolet rays. The phosphor film 4 on the inner surface of the bulb 1 receives and excites, and emits predetermined visible light outside the bulb 1 to emit light.

In the lamp L, the exhaust pipe 31 and the external lead wires 5c and 5c in the stem tube 3c are located in the exhaust pipe insertion hole 83 and the lead wire insertion holes 85 and 85 of the elastic holder 8, respectively. Even if stress is applied to the external lead wires 5c, 5c directly or indirectly via the power supply line 7 when the lamp L is installed, no stress is applied to the exhaust pipe 31, and each external Since the lead wires 5c and 5c are inserted through the separate lead wire insertion holes 85, they do not come into contact with each other to cause a short circuit. Further, the holder 8 is elastically held in the stem tube 3c and does not require any special adhesive or the like.

Therefore, the power supply line (wire harness)
It is possible to provide a long-life fluorescent lamp in which breakage from the root of the exhaust pipe 31 and breakage of the tip part can be prevented at the time of drawing the wire, and no leakage occurs, and also short-circuit between the external lead wires 5c and 5c can be prevented. . In addition, the exhaust pipe 3
Since the elastic holder 8 may be simply inserted into the stem tube 3c after the tip 1 is turned off, it is simple and does not require skill.
It should be noted that, when this mounting is performed, if the chamfered portion 8b is formed as shown in the drawing, it can be easily inserted.

4 (a) and 4 (b) show another embodiment of the elastic holder of the present invention. In the figure, the same parts as those in FIGS. Omit it. The elastic holder 8 shown in FIG. 6A has a pair of lead wire insertion grooves 86, 86 that are open on the outer surface of the main body 8a.

Further, in the elastic holder 8 of FIG. 6B, the side surface of the main body portion 8a is shaved and the partition wall 87 for separating the lead wire is formed in the central portion.
Is formed. In the figure, the outer diameter of the lower main body portion 8a and the width of the partition wall 87 are substantially the same as the inner diameter of the stem tube 3c, and the holder 8 inserted in the stem tube 3c crosses the external lead wires 5c, 5c at the partition wall 87 portion. There is nothing to do.

The elastic holder 8 shown in FIG. 4 is also the same as that of the embodiment shown in FIG. 3 except that the structure of the lead wire accommodating portion is different.

Further, FIG. 5 shows another embodiment of the elastic holder of the present invention. In the figure, the same parts as those in FIGS. 2 to 4 are designated by the same reference numerals and the description thereof will be omitted. The elastic holder 8 in FIG. 5 is provided with a closing portion 8c adjacent to the main body portion 8a and having a diameter larger than the main body portion 8a. The closing portion 8c covers the end surface of the sealing portion 2 and the lamp L is impacted. The sealing portion 2 is protected when it is received. In addition, this closing portion 8c
May be provided as shown by the alternate long and short dash line in FIG. 3, or may be formed to have a larger diameter of the main body portion 8a shown in FIG.

Further, as shown in FIG. 5, a locking portion 9 for mounting to a backlight or a lighting device may be formed at the base end portion of the elastic holder 8, and such a locking portion 9 is provided. The formed lamp does not require any special parts, and the lamp L can be easily attached to the device. And the lamp L of the present invention
As shown in FIG. 6, is used as a backlight of a liquid crystal display device such as a television or a personal computer in combination with a light diffusing plate D and a display plate P mounted on a reflector R as a light source to obtain high efficiency and the device. There is an advantage that it can be miniaturized.

The present invention is not limited to the above embodiment. For example, the discharge lamp is not limited to a fluorescent lamp, but can be applied to other straight tube discharge lamps that use a flare stem, such as a lamp that emits rare gas. Further, its application is not limited to display for a backlight device and the like, and can be applied not only to OA equipment and lighting, but also to lamps for ultraviolet radiation such as sterilization. Further, the number of external lead wires led out from one end of the bulb is not limited to two, and in a lamp using an auxiliary electrode, etc.
It may be more than a book.

Further, in a discharge lamp using a straight tubular bulb, there is a discharge lamp having an exhaust pipe on at least one side of the stem and not having an exhaust pipe on the other side for exhausting gas into the bulb and filling gas. Of course, the elastic holder may be inserted into the stem tube on the side not provided with such an exhaust pipe to prevent the external lead wires from contacting each other.

Further, the material of the elastic holder is not limited to silicone rubber, but may be molded of elastic rubber such as fluororubber or butyl rubber or synthetic resin material. Further, the number of insertion holes or insertion grooves of the external lead wire formed in the elastic holder is not limited to two, which is the minimum required for the hot cathode, and two or more plural holes are provided for use in a lamp having the above-mentioned auxiliary electrode. If a large number of elastic holders are provided, the external lead wire can be inserted into an arbitrary hole or groove when the elastic holder is mounted on the stem tube, and the work can be easily performed with little adjustment of directivity. Further, in the elastic holder having the insertion groove formed on the outer side surface, since the outer side surface has irregularities, the elastic holder can be held in the stem tube with a higher elastic force, so that it cannot be pulled out. Further, the chamfered portion at the tip of the holder is not essential.

The material of the bulb is not limited to lead glass, but may be soft glass such as soda lime glass or hard glass such as aluminosilicate glass, and the glass material of the flare stem may be appropriately selected according to the glass material of the valve to be combined. You just have to choose.

Furthermore, the connecting means for connecting the external lead wire and the power supply wire (wire harness) is not limited to that of the embodiment.

Further, as the illuminating device according to the present invention, in addition to the display device such as the backlight of the above-mentioned liquid crystal display device, OA equipment such as a reading or exposing device such as a facsimile or a copying machine, or general illuminating equipment, lighting equipment, etc. It is also applicable to an ultraviolet irradiation device and the like.

In the present invention, the lead wire insertion hole 85 and the lead wire insertion groove 86 formed in the elastic holder 8 in the above embodiment or both sides of the partition wall 87 shown in FIG. The lead wire insertion holes 85, 85 and the insertion grooves 86, 8 of the elastic holder 8 are also referred to as
A main body portion 8a between 6 is a portion called a partition for separating the lead wires 5c and 5c.

[0043]

As described above in detail, according to the present invention, in this lamp, the exhaust pipe and the external lead wire in the stem tube are located in the exhaust pipe receiving hole and the lead wire receiving hole of the elastic holder, respectively. When the lamp is installed, stress is not applied to the exhaust pipe even if stress is applied, such as when the external lead wire is pulled directly or indirectly through the power supply line, and each external lead wire is separated. Since they are inserted through the lead wire accommodation holes, they do not come into contact with each other to cause a short circuit. Further, the holder is elastically held in the stem tube and is firmly held without the need for a special adhesive or the like.

Therefore, the power supply line (wire harness)
It is possible to provide a discharge lamp having a long life, in which breakage from the root of the exhaust pipe and breakage of the tip portion can be prevented at the time of wiring, and no leakage occurs, and also short-circuit between external lead wires can be prevented. Further, the mounting work is simple and does not require skill because the elastic holder can be simply inserted into the stem tube after tipping off the exhaust pipe, so that the discharge lamp has various advantages and a lighting device using the discharge lamp. Can be provided.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of a discharge lamp of the present invention.

FIG. 2 is a front cross-sectional view of a main part showing an enlarged end portion including a stem portion of the lamp of FIG.

FIG. 3 is a perspective view of the elastic holder of the present invention shown in the lamp of FIG.

4A and 4B are perspective views showing another embodiment of the elastic holder of the present invention.

FIG. 5 is a perspective view showing another embodiment of the elastic holder of the present invention.

FIG. 6 is an exploded perspective view showing an embodiment of a backlight device according to the present invention.

[Explanation of symbols]

 L: Lamp 1: Glass bulb 2: Sealing part 3: Flare stem 31: Exhaust pipe 3b: Flare part 3c: Stem tube 5c: (External) lead wire 6: Electrode (hot cathode) 7: Power supply wire (wire harness) 8 : Elastic holder 83: Exhaust pipe housing (insertion hole) 85: Lead wire housing (insertion hole) 86: Lead wire housing groove (insertion groove) 9: Locking part D: Light diffusion plate P: Display plate R: Reflection mirror

Claims (5)

[Claims] 1. A straight tubular glass bulb; a flare stem sealed at each end of the bulb; a hot cathode connected to at least two lead wires provided on the flare stem; A discharge maintaining medium enclosed therein; and an elastic holder elastically inserted into the stem tube and having an accommodating portion for inserting the plurality of lead wires with insulating partition walls interposed therebetween. And a discharge lamp. 2. A straight tubular glass bulb; flare stems respectively sealed at both ends of the bulb; an exhaust pipe provided in the flare stem and a hot cathode connected to at least two lead wires; A discharge-holding medium sealed in the glass bulb; an elastic holder provided with an accommodating portion that is elastically inserted into the stem tube and that inserts the exhaust pipe and the plurality of lead wires with insulating partition walls interposed therebetween. A discharge lamp comprising: 3. The discharge lamp according to claim 1, wherein the elastic holder has a locking portion for supporting a lamp formed at a base end portion thereof. 4. The discharge lamp according to claim 1, wherein the lead wire accommodating portion of the elastic holder is a through hole or a cutout portion. 5. A lighting device comprising the discharge lamp according to any one of claims 1 to 4 mounted on a fixture or a lamp.